This experiment is a school demonstration of a carbonate reacting with acid. Fig. 1 shows sodium carbonate solution in a flask connected to a test tube of l...
Question 1 Report
This experiment is a school demonstration of a carbonate reacting with acid. Fig. 1 shows sodium carbonate solution in a flask connected to a test tube of limewater. Dilute hydrochloric acid is injected through the bung. The limewater turns cloudy as gas reaches it. The student must keep the syringe tip below the bung to prevent acid leaking out.
(a) Give the name of the gas that turns limewater cloudy. [1]
(b) Use the substances to give the word equation for the reaction in the flask. [2]
(c) Describe the visible change in the flask while the reaction is taking place. [1]
Answer Details
(a) The gas that turns limewater cloudy is carbon dioxide. [1]
(b) The word equation is:
sodium carbonate + hydrochloric acid → sodium chloride + water + carbon dioxide [2]
(c) The reaction in the flask causes fizzing, or bubbles to be produced, as carbon dioxide gas forms. [1]
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